Lead officer Supt Steve Lingley said: “We’re investigating it as an historic report and we want to make sure that we get the facts using the right resources.
“If Cyril Smith was stopped on the M1, and was arrested by Northamptonshire Police, I want to know who those officers are.
“We want to understand why they released him.
“We want to know if they came under any pressure, who that person was that gave the instruction to be released.”
The force’s Police and Crime Commissioner Adam Simmonds said the suspicion was officers were “brought under pressure from somebody in London to release Smith”.
It will be very interesting to see where this investigation goes. As always, it is invariably the cover-up that exposes the crime.